Wrench



April 14, 1925.

E. E. LYNCH ET AL WRENCH Filed Nov. 21, 1921 l/Il'I/I/I/IIIIII/III/I/III.

INVENTORS. finer/{wad BY ialwwziiyhcfi I a citizen of the United and thereby prevent Patented Apr. 14, 1925.

mm a. LYNCH, or HILMAR,

ASSIGNOBS TO IASTERENCH CORPORATION, A CORPORATION OF CALIFORNIA.

WRENCH.

Application flied November 21, 1921. Serial No. 516,589.

To all whom z'tmay concern." I

Be it known thatwe, EARNEST E. LYNCH, States, residing at Hilmar, in the county of Merced, State of California, and Homm A. a citizen of the United States, residing at Turlock 1n the county of Stanislaus, State of Call or nia, have invented a new and useful Wrench, of which the following is a specificatlon, in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to improvements 1n wrenches and the object of the invention is to provide an adjustable wrench that will automatically grip various shapes and sizes of nuts.

Another object is to rovide a wrench that will adjust itself t iiferent sizes of nuts and grip the fiat si as only without slipping injury to. the corners of the nut.

Another object is to make a wrench with a swinging jaw that will act like a ratchet on the nut and thus save time over other types of wrenches.

Another object of the invention is to so arran e one face of the movable jaw of the wrenc as to give it the eatest holding effect possible, its angle wit respect to the radius of movement thereof bein about 90 degrees. Variations in said ang e may be made but to produce a good wrench the angle should be as nearly that indicated in i 3 as possible.

other object of the invention is to so arrange the movable jaw with respect to the handle as to give the effect of an open end wrench.

Other objects of the invention will appear as the description proceeds.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout, but am aware that there may be modifications thereof.

Fig. 1 is a side elevation of the wrench.

Fig.2 is a plan of the wrench, and

Fig. 3 is a detail view of the jaws to illustrate the action thereof.

The numeral 1 indicates the main body of the wrench which has the handle portion 2 with the hole 3 for convenience in hanging up the wrench. Thejaw 4.- has the, rounde surface 5. The swinging jaw 6 has a shank distance from the center of the 7 extending into a slot in the handle, and is pivoted on the pin 8.

projection 9 on the shank is acted on by the spring 10 which is secured and held in tension by the pin 11.

The swinging. jaw 6 has the jaw ortion wlth the three surfaces 12, 13, 14 in t e relation of a portion of a hexagon. The surfaces 12 and 5 form the gripping means between the 'aws 4 and 6.

e action of the wrench in operation is as follows: The jaw 6 is hooked over the nut with the surface'12 in contact with a side as shown in Figure 1. The handle 2 is pulled in the direction of the arrow A, which will move the jaw 4 in the direction of the arrow B, and thus the surface 5 will move in the path of motion around the center in 8.

It will be noted that the path of motion 0 cuts into the hexagon nut, therefore the continued pull on the handle tends to orce the nut against the surface 12 of the jaw 6,

and the harder the pull the tighter the grip.

By moving the handle back t e jaw 6 slips over to the next surface of the nut and e action can be repeated rapidly. The surface 12 should be at a right angle to a line D drawn from the corner E to the center 8, said radial line duttin the movable jaw where the faces 12 and 13 intersect each other.

It will be seen that the reason for ing that the distance from the to the pivot shall be substantial rovidjaw ace 12 y twice the pivot to the handle aw face is to allow the proper length ong the jaw-face 14 when a nut almost twice as large as the nut shown in Figure 1 is attempte to be turned, and to provide the movable jaw with proper grip on the nut at all times.

The path of travel of the movable 'aw is such that when it is full opene the wrench Wlll hold a hexagona nut, one side of which is as long as the face 13.

What we claim is as follows but various modifications may be made in the construc- AND nouns. A. MEAD, or runnoox, onnrromrm,

tion shown in the drawings and above par-' a fiat grip ing surface extending substantially at rlg t angles to a radial line passing cy/through the pivot center and said ripping surface where it intersects another at grip- 5 ping surface of the movable jaw, the sand intersection being substantially double the distance from the pivot center that said pivot center is from the intersection of the aforesaid radial line with the outer face of 10 the fixed jaw when the movable jaw is closed.

2. A wrench comprising a bar having a fixed jaw with a rounded gripping surface,

on one end and a movable jaw pivoted adjacent the fixed aw the pivot lying on one 15 side of the handle axis and the jaw extending across said axis in all its movements, the fixed jaw also extendin across said axis and inclining toward the direction in which the pivoted jaw moves from the closed position. 20 In testimony whereof we have hereunto set our hands this 11th day of November, A. D.

a EARNEST E. LYNCH.

HOMER A. MEAD. 

